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The former Energy and Climate Change chief scientist, who died earlier this year, taught his department how to do policymaking without the hot air – by making the process data-led, iterative and open

The civil service has always had great people, argues former senior Cabinet Office official Andrew Greenway – but it must get better at valuing trust over hierarchy

As the civil service vows to improve the diversity of its graduate intake, former senior official Andrew Greenway asks whether Oxford's famed PPE degree is really a golden ticket to the top of the political and administrative elite